Electric air heater



March 2, 1954 J. w. cARTlNHoUR ELECTRIS AIR HEATER 2 Sheets-Sheet l Origiqal Filed May 4 1950 Tm N\ Mardi 2, 1954 J. w. CARTINHOUR Re. 23,795

ELECTRIC AIR HEATER Original Filed May 4, 1950 2 Sheets-Sheet 2 Reissued Mar. 2, 1954 ELECTRIC AIR HEATER John W. Cartinhour, Baldwin, N. Y., assignor to Foster Wheeler Corporation, New York, N. Y., a corporation oi.' New York Original No. 2,619,579, dated November 25, 1952, Serial No. 159,937, May 4, 1950. Application for reissue December 4, 1953, Serial No. 396,363

8 Claims.

Matter enclosed in heavy brackets appears in the original patent but forms no part of this reissue specification; matter printed in italics indicates the additions made by reissue.

This invention relates to a heat exchanger for air or other fluids and more particularly to an electric air heater.

In certain high pressure, high temperature service, utilizing large quantities of air for relatively short periods of time, for example only, the supply of air at approximately 1040 F. and 3000 p. s. i. g. with entering conditions at 650 F. and 3030 p. s. i. g., the heater must be capable oi being placed in service at its full capacity in a matter of a few seconds and must maintain steady conditions thereafter.

This requires a heater having unique features which are objects of this invention and which may be grouped as follows.

(1) Features enabling the exchanger to perform according to requirements;

(2) Features providing for safe operation; and

(3) Features contributing to an economic solution of the problem.

Single features do not necessarily contribute to only one of the groups and in several cases a feature contributes to all three.

The necessity for rapid starting combined with steady operating conditions is met in this invention by utilizing electric power as a source of heat. It can be made available with, extreme rapidity and its rate of input can be controlled with a high degree of` accuracy. Further, in order to reduce the time required to make heat available to a minimum, the heat storage capacity of the heating elements must be relatively small. This condition iS` satisfied by the use of high voltages and light resistive conductors. Moreover ythe relatively small mass of these resistive conductors' alone contributes to the economy of the structural design.

Although the primary purpose of the heating elements is to heat the air or other fluid to the desired temperatures, it is important that they accomplish their function safely. Therefore, these elements must be arranged so that the danger of overheating is minimized. For this reason the heating elements utilized herein are tubular in form and arranged so that the air or other fluid to be heated flows through them. 'I'he pressure drop through the tubular elements is sufficient to assure even distribution of now a metallicfshell, in a manner to be described, to'

through the elements. Since all metals lose strength at elevated temperatures, it is desirable to keep the sheell temperatures as low as possible. For this reason the cool air or fluid to be heated is directed in such a Way inside of the shell, by arrangements to be described, as to keep the shell at a uniformly low temperature. This reduces the cost of the shell by reducing its required thickness and, also, by eliminating the necessity for use of high-alloy materials for the shell. It also contributes to the safety of the shell or vessel by reducing thermal stresses which under the rapid starting conditions mentioned herein might eventually cause cracking of the shell and a serious operating failure. In addition, the maintance of uniform shell temperature at gasket joints in the shell reduces the possibility of air or fluid leakage through them.

Other objects and novel features of the invention include the provision of structure adaptable for providing heat exchange between different fluids at different temperatures and also of structure adaptable for electrical heating of fluids other than air having proper dielectric properties.

Other objects and novel features will become apparent from the following specification and accompanying drawing wherein:

a Fig. l is a longitudinal view, partially in sec- Fig. 5 is a fragmentary transverse section taken along line 5.-5 of Fig. 4 also viewed in the Adirection of the arrows; and

Fig. 6 is an isometric view in diagrammatic form of the heating tube arrangement and electric circuit involved.

Referring to the drawings, l0 denotes a hollow shell of metal or other desirable material which is provided at its opposite ends with tubular end members4 Il and l2 of larger overall cross sectional dimensions than that of shell lllv and each f, having two differently dimensionedinternal pcr'- tions Ila, Hb and I2a, I2b respectively each dif- 'ferent from that of the internal dimensions of .i 3 shell IIl to denne the respective shoulders IIc, IId and I2c, I2d. The end members lI and. I2 are secured respectively to the opposite ends of shell I as by welding or the like at I3 and I4.

The inner wall of shell I0 is provided With a snugly fitting tubular liner I5 preferably of sheet metal. This liner I5 is optional if shell Ill is itself of metal suitable for the intended purposes. Metal closure members I6, I6a tting Within the recesses IIa and I2a with sealing gaskets G abut the respective shoulders IIc and I2c and are tightened against the gaskets G and secured in place as by bolts and nuts I1, I8. External reinforcements 20, 2I are provided for the respective closure members I6, Ilia and these are held securely against the latter by segmental locking rings 22, 23 fitting edgewise respectively in the annular grooves 24, 25 in portions IIa and I2a of members II and I2 and bolted to the respective reinforcements 2|), 2I by bolts 26.

A tubular shell 28 o-f sheet metal or the like having smaller cross sectional external dimensions than the inner cross sectional dimensions of liner I5 or inner dimension of shell I0 is located in a centralized yposition within shell IU, one end projecting into the portion I2b of end member I2. The shell 28 is provided at Various external points with spacing ns or lugs 29 which centralize it relative to liner I5 and shell I0 throughout its length so that shell 28 and lining I5 dene an annular space S` extending from the shoulder I2d to the far end of shell 28 where the space S communicates with a chamber portion C of shell I0.

A transversely extending partition 30 divides the inner shell into a tube bearing compartment D to one side of the partition 3l) and a cold air space E at its opposite side. Openings 3i in the wall of shell 28 provide communication between spaces S and E for purposes presently to be described.

An inlet nozzle 33, preferably havinga lining 34, is secured as by welding or the likev at 35 about an opening`36 provided in shell I0 and its lining I5 and communicates with the annular space S. An outlet nozzle 31 preferably having a lining 38 is secured as by welding or the like at 39 about an opening 40 communicating with space S. An inner shell or tube 4I of smaller diameter than lining 38 and deilning with it an annular space passageway H extends from the outer end of nozzle 31 inwardly and is secured as by welding or the like at 42 about an opening 43 in shell 28 which communicates with space D of the latter. Thus all internal surfaces of the shell I0 and its ends are in surface contact with air or iluid at its cool entering temperature and the shell I0 remains substantially at this temperature during use.

Transversely extending metallic tube supports 45 each fitting Within an annular recess of a peripheral supporting ring 46 are positioned at spaced apart points within the shell 28', the rings 45 fitting snugly but movably the internal diameter oi shell 28. 'I'he particular ring 46 of the tube support 45 in closest proximity to partition 38 labuts an annular segmental ring 41' secured as by lugs 41 or the like to the inner surface of shell V28. 'I'his ring 4'1l serves asa limit stop. The voutermost vsupporting ring 45 adjacent the opposite end of shell 28 provided with vlongitudinally extending expansion. rods. 43. which Vt slidably .in openings. provided .in .guide flanges 48 soldered .or the` lketo the shell 28.A

Each t'ubesupport 45. has a like numberof iden 4. tically arranged openings 50 (Fig. 4) in each of which av` tubular bushingil of velectric insulating material is mounted. Tubes 520i` electrical resistor material, for example, nickel-chromium alloy, or other equivalent electric resistor material are threaded longitudinally through axially aligned bushings 5I in the respective tube supports 45. one end of each tube 52 communicating with chamber C, and the opposite end of eachtube 52 communicating with chamber D. The tube support plates 45 t rings 4E, and the latterv t the inner surface of shell 28 and, similarly, bushings 5 I t openings 5I) and tubes 52 nt bushings 5I sufliciently closely to limit leakage. of `air from space C to space D through space F to a very small quantity, but the fits are not close enough to prevent relative expansion or contraction 'of parts- 'I'he ends of all resistor tubes 52 projecting into chamber C in each horizontal row of tubes (Fig. 6) are electrically interconnected by distributors 53 and all the latter are electrically con-V are electrically interconnected by distributors 59, i

and the latter are electrically connected to a bus SB which is, for examplel grounded by connection at 6I with the shell 28 which latter is connected electrically by the weld at 42 to the shell 4I which is in contact with the grounded outlet nozzle 31.

All the tubes 52 are thusv connected in electrical parallel and may be supplied from a common power source P connected to the .terminal 5E and to ground. YAppropriate voltage and cu-rrent controls (not shown) are connected in the power circuit in the usualv manner. 'While electrical parallel connection for tubes 52 is shown. it is to be understood that the electrical con,n

nection of the tubes 52, also, may be either series or series-parallel depending upon the type of electric power available at the place of use, the

requirement being that electric current flow in the tubes will be sullicient to heat them to necesn sary temperatures to produce desired heating of the air or other fluid :flowing through theV resistor tubes 52.

Operation Electrical power P is connected to the tubes' 52 as described. Air is introduced through nozzle 33 and is rst directed to ow in space S between lining I5 and shell 28 has an envelope of air to maintain substantially uniform temperature of the outer shell TID and its lining I5 to space or chamber C whence lit flows through each of the electrically heated tubes 521:0Y space or chamber D being heated in its passage through the tubes. From chamber D vthe heated air flows outwardly through tube 4I :in nozzle V31. Av

small portion of the cold: air entering nozzle .33

also ows from passage S through some ofr the openings 3l into space `or chamber E: and from the latter outwardly through .others of the openy ings 3| and through 'the annular fspace I-I and rejoins the heated air flowing in tube 4I through openings 4Ib in the wall :of thela-tter. The-.cool

airy in chamber .E .and-ain space :H- acts to keep the hot end of shell Ill and outlet nozzle 321 at: :it substantially the :sam-e .temperatureas' Modification With slight modification, and without the use of electric heating, the device can be utilized to provide heat exchange between any cold and any hot fluid. In such case, the material of tubes 52 need not be of electric resistor material, but may be of any other metal. Electric connections to the tubes can be eliminated and the end tube supports 45 and their rings 46 provide leak proof seals at opposite ends of tubes 52 and shell 28 so that compartment or chamber F is sealed off from chambers C and D. An inlet nozzle and an outlet nozzle each communicating with chamber F are provided. One of the two fluids is circulated via nozzle 33 through space S, chamber C, tubes 52, chamber D and outlet nozzle 31 as previously described. The other of the two fluids is fed into chamber F around the external surfaces of tubes '52 in heat exchange relationship with the fluid flowing through the latter tubes and finally out through the second outlet nozzle. Relative flow of the two fluids may be in countercurrent direction or the same direction as desired.

While specific embodiments of the invention have been disclosed, variations in structural detail Within the scope of the claims are possible and are contemplated. There is no intention l therefore of limitation to the exact details shown and described.

What is claimed is:

l. Apparatus for heating air or other fluids comprising an outer elongated shell, removable cover members at opposite ends of said shell, means for securing said cover members in fluidtight relationship with the outer shell, an inner shell supported within and extending longitudinally of the outer shell, the inner shell being so dimensioned and positioned within the outer shell as to define a fluid flow passageway around f the inner shell between the inner surface of the outer shell and the outer surface of the innershell, tube supports spaced from one another and spanning in a fluid-tight manner the crosssectional area of the inner shell and in spaced relationship with the opposite ends of the outer shell, one of the tube supports defining one side of a fluid inlet chamber within the outer shell between one end of said outer shell and said one support, the inlet chamber being in communication with the fluid passageway, a partition spanning the cross-sectional area of the inner shell intermediate the opposite end of the outer shell and the other tube support, thereby defining one end .of a heated fluid outlet compartment between said other tube support and the partition and a cool fluid space between said opposite end of the outer shell and said partition, the cool fluid space being in communication with said fluid flow passageway to receive fluid therefrom, a fluid inlet nozzle in communication with the fluid flow passageway adjacent said opposite end, a fluid outlet nozzle in com-v munication with the outlet compartmentat said opposite end, tubes'carried by said supports and extending in spaced relationship with one another longitudinally through the inner shell with their opposite ends extending into the respective inlet and outlet chambers, electrical connections interconnecting all the tubes at one end to a common conductor, electrical connections interconnecting all the tubes at the other end to a second common conductor, and means for connecting the said common conductors to a source of electric power whereby said tubes may be heated electrically and whereby the fluid to be heated will be directed from the inlet nozzle through the fluid passageway in surface contact with the inner and outer shells and into said inlet chamber, then through the tubes being heated in flow therethrough, and into said heated fluid outlet compartment chamber and thereafter through the outlet nozzle.

2. Apparatus for heating air or other fluids comprising a cylindrically shaped outer shell, removable cover members at opposite ends of said shell, means for securing said cover members in fluid-tight relationship with the outer shell, a cylindrically shaped inner shell supported within and extending axially of the outer shell, the inner shell being of a llesser diameter than and so positioned within the outer shell as to define a fluid flow passageway around the inner shell between the inner surface of the outer shell and the outer surface of the inner shell, tube supports spaced from one another and spanning in a fluid-tight manner the crosssectional area of the inner shell and in spaced relationship with the opposite ends of the outer shell, one of the tube supports defining one side of a fluid inlet chamber within the outer shell between one end of said outer shell and said one support, the inlet chamber being in communication with the fluid passageway, a partition spanning the cross-sectional area of the inner shell intermediate the opposite end of the outer shell and the other tube support, thereby defining one end of a heated fluid outlet compartment between said other tube support and the partition and a cool fluid space between sai-d opposite end of the outer shell and said partition, the cool fluid space being in communication with said fluid flow passageway to receive fluid therefrom, a fluid inlet nozzle in communication with the fluid flow passageway adjacent said opposite end, a fluid outlet nozzle in communication with the outlet compartment at said opposite end, tubes carried by said supports and extending in spaced relationship with one another longitudinally through the inner shell with their opposite ends extending into the respective inlet and outlet chambers, electrical connections interconnecting all the tubes at one end to a common conductor, electrical connections interconnecting all thetubes at the other end to a second common conductor, and means for connecting the said common conductors to a source of electric power whereby said tubes may be heated Aelectrically and whereby the fluid to be comprising an outer elongated shell, removable cover members at opposite ends of said shell,

means for securing said covermembers in uidsaves' tiene reranonshm with me outer shell, aninner' shellV supported within and extendingl longitudinally' of theouter shell, the. inner shell being so dmensioned and positioned within the outer shell asV to define a fluid flow passagewayr around the inner shell between the. inner surface of the outery shell and the outer surface of the inner shell, tube supports spaced from one' another'I and. spanning in ak fluid-tight manner the crosssectional area.k of the inner4 shell andi in spaced relationship with the opposite: ends of the outer shell, one of: the tubef supports defining one sideof a fluid inlet.A chamber within the. outer shell between` oney end ci' said outer shell' and' said one support, the inlet chamber being in communication with the fluid. passageway, a'. partition spanning the cross-sectional area of` the inner shell intermediate the opposite end of the outerl shell and the other tube support, thereby defining one end' of a heated fluid outlet compartment between said other tube support and the partition and a cool fluid' space between said opposite end of the outer shell and said partition, the cool fluid space being in communication with said fluid flow passageway to receive fluid therefrom, a fluid inlet nozzle in communication with the fluid flow passageway adjacent said opposite end, a` fluid outlet nozzle in communication with the outlet compartment at said opposite end, said outlet nozzle comprising an inner sleeve so dimensioned and positioned within the' nozzle as to define a-'ilow path around said sleeve between the outer periphery thereof and the nozzle, said sleeve being in communication at the inletl end thereof with the heated fluid compartment and at the outlet'end" with the nozzle outlet, the flow path being in communication at one end thereof with saldi fluid passageway to receivefluid therefrom. and lat the opposite end with said nozzle outlet, tubes carried by said supports andI extending in spaced relationship with one another longitudinally through the inner shell with their opposite ends extending into the respective inlet and outlet chambers, electrical connections interconnecting all the tubes at one endv to a common conductor, electrical connections interconnecting all the tubes at the other end to ay second common conductor, and meansv for connecting the said common conductors toia source of electric power whereby said tubes maybe heated electrically and whereby the fluid to be heated will be directed from the inlet nozzle through the fluid passageway in surface contact with the inner and outer shells and into sai-d` inlet' chamber, then through the tubes being heated in flow therethrough, and into said heated fluid outlet compartment chamber and thereafter through the inner sleeve of the outlet nozzle.

4. Apparatus for heating air or other fluids comprising an outer elongated shell, removable cover members at opposite ends of said shell, means for securing said cover members in fluidtight relationship with the outer shell, an inner shell supported within and extending longitudinally of the outer shell, the inner shell being so dimensioned and positioned within the outer shell as to define a fluid flow passageway around the inner shell between the inner surface of the outer shell and the outer surface of the inner shell, tube supports spaced from one another and spanning ina` fluid-tight -nianner the cross-sec- 8 of a. fluid inlet' chamber within the outer shell between one end of said outer shell and said one support, the inlet chamber being in communica-- tion with the fluid passageway', a partition spanning the cross-sectional area of the inner shell intermediate theA opposite end ofthe outer shell and the other tube support, thereby defining oneV end of a heated fluid outlet compartment between said other tube support and the partition and a cool uid space between said opposite end of the outer shell and said partition, the cool fluid space being in communication with; said fluid flow passageway to receive fluid therefrom, a fluid inlet nozzle in communication with the fluid flow passageway adjacent said opposite end, a fluid outlet nozzle in communication with the outlet compartment at said opposite end, tubes carried by said supports and extending in spaced relationship with one another longitudinally through the inner shell with their opposite ends extending into the respective inlet and outlet chambers, electrical connections interconnecting all the tubesk adjacent one end of the outer shell l, to a common conductor, electrical connections tion area of' the-inner shell-and in spaced rela-N i tionship with the opposite" ends o'fthe {outerV interconnecting all the tubes adjacent the other end of said shell to a second common conductor,l means at said one end of the outer shell and extending into said inlet chamber for connecting the common conductor at said one end to a source of electric power,V and means for connecting the common conductor at said other end to the source, whereby said tubes may be heated electrically and whereby the fluid to be heated will be directed from the inlet nozzle through the fluid passageway in surface contact with` the inner and outer shells' and into said inlet chamber, then through the tubes being heated in flow therethrough, and into said heated fluid outlet .compartment chamber and thereafter through the outlet nozzle.

5. Apparatus for heating air or other fluids comprising a cylindrically shaped outer shell,

removable cover members at opposite ends of l and the outerV surface of the inner shell', tube supports spaced from one another and spanning in a fluid-tight manner the cross-sectional area of the inner shell and in spaced relationship with the opposite ends ofthe outer shell, one of the tube supports def'lning one sidev of a fluid inlet chamber within the outer shell between one end of said outer shell and said one support, the inlet chamber being in communication with the fluid passageway, a partition spanning the crosssectional area of the inner shell intermediate the opposite end o-f the outer shell and the other tube support, thereby defining one end of a heated fluid outlet compartment between said other tube support and the partition and a cool fluid space between said opposite end of the outer shell and said partition, the cool fluid space being in communication with said fluid flow passageway to receive fluid therefrom, a fluid inlet nozzle in communication with thev fluid flow passageway at said opposite end, said outlet nozzle, comprisand positionecl within the nozzle as to denne a ow path around said sleeve between the outer periphery thereof and the nozzle, said sleeve being in communication at the inlet end thereof with the heated lluid compartment and at the outlet end with the nozzle outlet, the flow path being in communication at one end thereof with said fluid passageway to receive fluid therefrom and. at the opposite end with said nozzle outlet, tubes carried by said supports and extending in spaced relationship with one another longitudinally through the inner shell with their opposite ends extending into the respective inlet and outlet chambers, electrical connections interconnecting all the tubes adjacent one end of the outer shell to a common conductor, electrical connections interconnecting all the tubes adjacent the other end of said shell to a second common conductor, means at said one end of the outer shell and extending into said inlet chamber for connecting the common conductor at said one end to a source of electric power, and means for connecting the common conductor at said other end to the source, whereby said tubes may be heated electrically and whereby the fluid to be heated will be directed from the inlet nozzle through the fluid passageway in surface contact with the inner and outer shells and into said inlet chamber, then 'through the tubes being heated in flow therethough, and into said heated fluid outlet compartment chamber and thereafter through the inner sleeve of the outlet nozzle.

6. Apparatus for heating air or other fluids comprising an outer elongated shell enclosed at the opposite ends thereof, at least one of said opposite ends being closed by a removable cover member, means for securing said removable cover member in fluid-tight relationship with the outer shell, an inner shell supported within and extending longitudinally of the outer shell, the inner shell being so dimensional and positioned within the outer shell as to define a fluid flow passageway around the inner shell between the inner surface of the outer shell and the outer surface of the inner shell, tube supports spaced from one another and spanning in a fluid-tight manner the cross-sectional area of the inner shell and in spaced relationship with the opposite ends of the outer shell, one of the tube supports deflning one side of a fluid inlet chamber within the outer shell between one end of said outer shell and said one support, the inlet chamber being in communication with the fluid passageway, a partition spanning the cross-sectional area of the inner shell intermediate the opposite end of 5 the outer shell and the other tube support, thereby defining one end of a heated fluid outlet compartment between said other tube support and the partition and a cool fluid space between said opposite end of the outer shell and said partition, the cool fluid space being in communication with said fluid flow passageway to receive fluid therefrom, a fluid inlet nozzle in communication with the fluid flow passageway adjacent said opposite end, a fluid outlet nozzle in communication with the outlet compartment at said opposite end, tubes carried by said supports and extending in spaced relationship with one another longitudinally through the inner shell with their opposite ends extending into the respective inlet and outlet chambers, electrical connections interconnecting all the tubes at one end to a common conductor, electrical connections interconnecting all the tubes at the other end to a second common conductor, aud means for con- 10 necting the said common conductors to a source of electric power whereby said tubes may be heated electrically and whereby the fluid to be heated will be directed from the inlet nozzle through the fluid passageway in surfacek contact with the inner and outer shells and into said inlet chamber, then through the tubes -being heated in flow therethrough, and into said heated fluid outlet compartment chamber and thereafter through the outlet nozzle.

7. Apparatus for heating air or other fluids comprising a cylindrically shaped outer shell, cover members at opposite ends of said shell, 'at least one of said cover members being removable, means for securing said removable cover members in fluid-tight relationship with the outer shell, a cylindrically shaped inner shell supported within and extending aially of the outer shell, the inner shell being of a lesser diameter than and so positioned within the outer shell as to define a fluid flow passageway around the irl,- ner shell between the inner surface of the outer shell and the outer surface of the inner shell, tube supports spaced from one another and spanning in a fluid-tight manner the cross-.sectional area of the inner shell and in spaced relationship with the opposite ends of the outer shell, one of the tube supports defining one side of a fluid inlet chamber within the outer shell between one end of said outer shell and said one support, the inlet chamber being in communication with the fluid passageway, a partition spanning the cross-sectional area of the inner shell intermediate the opposite end of the outer shell and the other tube support, thereby defining one end of a heated fluid Ioutlet compartment between said other tube support and the partition and a cool fluid space between said opposite end of the outer shell and said partition, the cool fluid space being in communication with said fluid flow passageway to receive fluid therefrom, a fluid inlet nozzle in communication with the fluid flow passageway adjacent said opposite end, a fluid outlet nozzle in communication with the outlet compartment at said opposite end, tubes carried by said supports and extending in spaced relationship with one another longitudinally through the inner shell with their opposite ends extending into the respective inlet and outlet chambers, electrical connections interconnecting all the tubes at one end to a common conductor, electrical connections interconnecting all the tubes at the other end to a second common conductor, and means for connecting the said common conductors to a source of electric power whereby said tubes may be heated electrically and whereby the fluid to be heated will be directed from the inlet nozzle through the fluid passageway in surface contact with the inner and outer shells and into said inlet chamber, then through the tubes being heated in flow therethrough, and into said heated fluid outlet compartment chamber and thereafter through the outlet nozzle.

8. Apparatus for heating air or other fluid comprising an outer elongated shell, cover members at opposite ends of said shell, at least one of said cover members being removable, means for securing said removable cover member in fluidtight relationship with the outer shell, an inner shell supported within and extending longitudinally of the outer shell, the inner shell being so dimensioned and positioned within the outer shell as to define a fluid flow passageway around the inner shell between the inner surface of the outer shell and the oujg'r surface of the inner outlet, tubes can'ied by said support; and eg;- klll la@ mums .mm1 from @ne mother ma magma in mm mtl-@map ,with me @muy a Md-H9111? manner #he c sfsqzf longitudinally through the inner sneu with my Ke@ .,91 the shell and in .sm rela.- opposite ma@ meadow im me respective inzet with me opposite; en@ of the: outer shell, 5 and outlet shambm. electrical connection; nl crconngoting qll the tubes at Qne end to a eemmndir. electrieal connections intemonim? .qll the tubes at the other end to a second @muten and means for connecting the Sgd elmducors to a source of elegwhereby said tubes may be yheztscl whereby the fluid to be heated ed imm the inlet nozzle through the *.lwy in .Sifce contact with the @mi Shells and into said inlet cham imm .HQUQR the `tubes being heated in flow tlgrgh. and into said heated fluid outlet smmflrtmn @hembsr and thereaften through #has ,slszm of the .cnam nozzle.

JOHN W.

v.s2Ss:.Irre@..S in the. @1.99 @his mman mit?? Ul@ halted fluid ompartment and lgmfs the. wie? and. with the @pazze outlet, the flow 30 '13265513 fd'uid @as saasway t@ www@ fluid there:-

gf the fmsite end with ,Suid negarle 

